Tamper-proof cap



FIG. 1 is a bottom and left perspective view of a tamper-proof cap;

FIG. 2 is a bottom and right perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the drawings illustrate portions of the tamper-proof cap that form no part of the claimed design. 

CLAIM The ornamental design for a tamper-proof cap, as shown and described. 